DESCRIPTION

The Cdk slider widget creates a visual slider box with a label and a slider field.
The following are functions which create or manipulate the Cdk slider
box widget.

AVAILABLE FUNCTIONS

activateCDKUSlider

activates the slider widget and lets the user interact with the widget.
The parameter slider is a pointer to a non-NULL slider widget.
If the actions parameter is passed with a non-NULL value, the characters
in the array will be injected into the widget.
To activate the widget
interactively pass in a NULL pointer for actions.
If the character entered
into this widget is RETURN or TAB then this function will return a
value from the low value to the high value.
It will also set the widget data exitType to vNORMAL.
If the character entered into this
widget was ESCAPE then the widget returns
the unknownUnsigned value (see the cdk_objs.h header file).
The widget data exitType is set to vESCAPE_HIT.

destroyCDKUSlider

removes the widget from the screen and frees memory the object used.

drawCDKUSlider

draws the slider widget on the screen.
If the box option is true, the widget is drawn with a box.

eraseCDKUSlider

removes the widget from the screen.
This does NOT destroy the widget.

getCDKUSliderBox

returns true if the widget will be drawn with a box around it.

getCDKUSliderHighValue

returns the high value of the slider widget.

getCDKUSliderLowValue

returns the low value of the slider widget.

getCDKUSliderValue

returns the current value of the widget.

injectCDKUSlider

injects a single character into the widget.
The parameter slider is a pointer to a non-NULL slider widget.
The parameter character is the character to inject into the widget.
The return value and side-effect (setting the widget data exitType)
depend upon the injected character:

RETURN or TAB

the function returns
a value ranging from the slider's low value to the slider's high value.
The widget data exitType is set to vNORMAL.

ESCAPE

the function returns
the unknownUnsigned value (see the cdk_objs.h header file).
The widget data exitType is set to vESCAPE_HIT.

Otherwise

unless modified by preprocessing, postprocessing or key bindings,
the function returns
the unknownUnsigned value (see the cdk_objs.h header file).
The widget data exitType is set to vEARLY_EXIT.

moveCDKUSlider

moves the given widget to the given position.
The parameters xpos and ypos are the new position of the widget.
The parameter xpos may be an integer or one of the pre-defined values
TOP, BOTTOM, and CENTER.
The parameter ypos may be an integer or one of the pre-defined values LEFT,
RIGHT, and CENTER.
The parameter relative states whether
the xpos/ypos pair is a relative move or an absolute move.
For example, if xpos = 1 and ypos = 2 and relative = TRUE,
then the widget would move one row down and two columns right.
If the value of relative was FALSE then the widget would move to the position (1,2).
Do not use the values TOP, BOTTOM, LEFT,
RIGHT, or CENTER when relative = TRUE.
(weird things may happen).
The final parameter refresh is a boolean value which
states whether the widget will get refreshed after the move.

newCDKUSlider

function creates a slider widget and returns a pointer to it..
Parameters:

screen

is the screen you wish this widget to be placed in.

xpos

controls the placement of the object along the horizontal axis.
It may be an integer or one of the pre-defined values
LEFT, RIGHT, and CENTER.

ypos

controls the placement of the object along the vertical axis.
It may be an integer or one of the pre-defined values
TOP, BOTTOM, and CENTER.

title

is the string to display at the top of the widget.
The title can be more than one line; just provide a carriage return
character at the line break.

label

is the string to display in the label of the slider field.

fillerCharacter

is the character to be used to draw the slider bar in the field.

fieldWidth

controls the width of the widget.
If you provide a value
of zero the widget will be created with the full width of the screen.
If you provide a negative value, the widget will be created the full width
minus the value provided.

currentValue

is the value of the slider field when the widget is activated.

lowValue and

highValue

are the low and high values of the widget respectively.

increment

is the regular increment value

fastIncrement

is the accelerated increment value.

box

is true if the widget should be drawn with a box around it.

shadow

turns the shadow on or off around this widget.

If the widget could not be created then a NULL pointer is returned.

positionCDKUSlider

allows the user to move the widget around the screen via the cursor/keypad keys.
See cdk_position (3) for key bindings.

setCDKUSlider

lets the programmer modify certain elements of an existing slider widget.
The parameter names correspond to the same parameter
names listed in the newCDKUSlider function.

setCDKUSliderBackgroundAttrib

sets the background attribute of the widget.
The parameter attribute is a curses attribute, e.g., A_BOLD.

setCDKUSliderBackgroundColor

sets the background color of the widget.
The parameter color is in the format of the Cdk format strings.
See cdk_display (3).

setCDKUSliderBox

sets whether the widget will be drawn with a box around it.

setCDKUSliderBoxAttribute

function sets the attribute of the box.

setCDKUSliderHorizontalChar

sets the horizontal drawing character for the box to the given character.

setCDKUSliderLLChar

sets the lower left hand corner of the widget's box to the given character.

setCDKUSliderLRChar

sets the lower right hand corner of the widget's box to the given character.

setCDKUSliderLowHigh

sets the low and high values of the widget.

setCDKUSliderPostProcess

allows the user to have the widget call a function after the
key has been applied to the widget.
The parameter function is the callback function.
The parameter data points to data passed to the callback function.
To learn more about post-processing see cdk_process (3).

setCDKUSliderPreProcess

allows the user to have the widget call a function after a key
is hit and before the key is applied to the widget.
The parameter function is the callback function.
The parameter data points to data passed to the callback function.
To learn more about pre-processing see cdk_process (3).

setCDKUSliderULChar

sets the upper left hand corner of the widget's box to the given character.

setCDKUSliderURChar

sets the upper right hand corner of the widget's box to the given character.

setCDKUSliderValue

sets the current value of the widget.

setCDKUSliderVerticalChar

sets the vertical drawing character for the box to the given character.

KEY BINDINGS

When the widget is activated there are several default key bindings which will
help the user enter or manipulate the information quickly.
The following table
outlines the keys and their actions for this widget.

Key

Action

Down Arrow

Decrements the field by the normal decrement value.

Up Arrow

Increments the field by the normal increment value.

u

Increments the field by the normal increment value.

Prev Page

Decrements the field by the accelerated decrement value.

U

Decrements the field by the accelerated decrement value.

Ctrl-B

Decrements the field by the accelerated decrement value.

Next Page

Increments the field by the accelerated increment value.

D

Increments the field by the accelerated increment value.

Ctrl-F

Increments the field by the accelerated increment value.

Home

Sets the value to the low value.

g

Sets the value to the low value.

End

Sets the value to the high value.

G

Sets the value to the high value.

$

Sets the value to the high value.

Return

Exits the widget and returns the
current value.
This also sets the widget data exitType to vNORMAL.

Tab

Exits the widget and returns the current value.
This also sets the widget data exitType to vNORMAL.

Escape

Exits the widget and returns
the unknownUnsigned value (see the cdk_objs.h header file).
This also sets the widget data exitType to vESCAPE_HIT.

Ctrl-R

Refreshes the screen.

If the cursor is not pointing to the field's value, the following
key bindings apply. You may use the left/right arrows to move the
cursor onto the field's value and modify it by typing characters to
replace the digits and sign.